Forgot to add pipe reader to CMake

src/subprocess/CMakeLists.txt

@@ -4,9 +4,11 @@ add_library(linuxdeploy_subprocess STATIC
     subprocess.cpp
     subprocess_result.cpp
     process.cpp
+    pipe_reader.cpp
     ${headers_dir}/subprocess.h
     ${headers_dir}/subprocess_result.h
     ${headers_dir}/process.h
+    ${headers_dir}/pipe_reader.h
 )
 target_include_directories(linuxdeploy_subprocess PUBLIC ${PROJECT_SOURCE_DIR}/include)